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avoid using wxDC::Blit() and wxDC::GetPixel() on window that is being painted, results are unpredictable on wxGTK

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see #14067

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70823 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Paul Cornett 2012-03-06 04:26:33 +00:00
parent 944a0ae011
commit d9a1b21859
1 changed files with 23 additions and 13 deletions
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36
samples/drawing/drawing.cpp
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@ -554,19 +554,29 @@ void MyCanvas::DrawTestLines( int x, int y, int width, wxDC &dc )
void MyCanvas::DrawDefault(wxDC& dc)
{
// mark the origin
dc.DrawCircle(0, 0, 10);
#if !defined(wxMAC_USE_CORE_GRAPHICS) || !wxMAC_USE_CORE_GRAPHICS
// GetPixel and FloodFill not supported by Mac OS X CoreGraphics
// (FloodFill uses Blit from a non-wxMemoryDC)
//flood fill using brush, starting at 1,1 and replacing whatever colour we find there
dc.SetBrush(wxBrush(wxColour(128,128,0), wxSOLID));
wxColour tmpColour ;
dc.GetPixel(1,1, &tmpColour);
dc.FloodFill(1,1, tmpColour, wxFLOOD_SURFACE);
#endif
// Draw circle centered at the origin, then flood fill it with a different
// color. Done with a wxMemoryDC because Blit (used by generic
// wxDoFloodFill) from a window that is being painted gives unpredictable
// results on wxGTK
{
wxImage img(21, 21, false);
img.Clear(1);
wxBitmap bmp(img);
{
wxMemoryDC mdc(bmp);
mdc.SetBrush(dc.GetBrush());
mdc.SetPen(dc.GetPen());
mdc.DrawCircle(10, 10, 10);
wxColour c;
if (mdc.GetPixel(11, 11, &c))
{
mdc.SetBrush(wxColour(128, 128, 0));
mdc.FloodFill(11, 11, c, wxFLOOD_SURFACE);
}
}
bmp.SetMask(new wxMask(bmp, wxColour(1, 1, 1)));
dc.DrawBitmap(bmp, -10, -10, true);
}
dc.DrawCheckMark(5, 80, 15, 15);
dc.DrawCheckMark(25, 80, 30, 30);